TMDb/Greenland 2: Migration TV Greenland 2: Migration premieres May 8 on HBO Max. Gerard Butler returns in this post-apocalyptic thriller about survival after a comet strike. April 26, 2026 AceShowbiz - Greenland 2: Migration is set to premiere on HBO Max on May 8, marking the streaming debut of Gerard Butler's latest post-apocalyptic thriller. The sequel follows the aftermath of a catastrophic comet strike that devastated Earth, continuing the story of structural engineer John Garrity and his family as they navigate a shattered world.